Links points wrong with "mvn site"

Hello!

Trying to create report-site with maven.
But some links does not work so well.

We got a pretty large project like:
a
-b
--c
--d
--e

In b we got the modules:
  <modules>
      <module>e</module>
      <module>d</module>
      <module>c</module>
  </modules>

But when we generate the site with "mvn site", everything seem to be put at correct location.

like in a:
target/site:
a
-b
--c
--d
--e

But in index.html at b we got these urls to c,d and e:
  <li class="none">
                    <a href="e/index.html">e</a>
          </li>
             
    <li class="none">
                    <a href="d/index.html">d</a>
          </li>
             
    <li class="none">
                    <a href="../index.html">c</a>
          </li>


As you can see the link to c points to wrong location, but the other e and d works fine.

We use this plugin in each pom, but with different outputDirectory:
      <reporting>
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-surefire-report-plugin</artifactId>
          <version>2.4.2</version>
          <configuration>
              <outputDirectory>../../target/site/b/e</outputDirectory>
          </configuration>
        </plugin>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-site-plugin</artifactId>
          <version>2.0-beta-5</version>
          <configuration>
              <outputDirectory>../../target/site/b/e</outputDirectory>
          </configuration>
        </plugin>
      </plugins>
  </reporting>

The same for c "../../target/site/b/c"


So if you guys got any idea why c points wrong please let me know!

Best regards
Fredrik